I’ve used the MobileStorm API with ExpressionEngine a bit, and would be happy to make an add-on to facilitate this sort of thing. Unfortunately the problem right now is that there isn’t a unified/standard API for SMS (that I know of), so each SMS service company has different API calls and it would be cumbersome to try to integrate all of them. So this is the kind of thing that may be better done on a case-by-case basis.
Thank you for your reply! I was hoping somebody had done something like this before.
Have you, or are you able to, set something up where the service is provided for members with paid accounts. That is, they need to have an “account” with credits (which they pay for prior to using the service) to be able to send SMS messages? The idea is to have customers subscribe to their favourite restaurant for receiving text messages. The restaurants broadcasts by sending text messages when they have a special dish of the day. (Where I am located, we eat a lot of fresh fish. But some fish are not available on demand and can only be supplied by the catch some fishermen are lucky to get. And then the restaurants need to sell them as quickly as possible so as not to store them or throw them away.)